.panel{
    position: fixed;
    right: 0px;
    top:0px;
    width: 20%;
    height: 100%;
    padding: 50px;
    overflow: auto;
}
#cmd{
    width: 100%;
}
#output{
    width:100%;
    max-height: 300px;
    min-height: 100px;
    bottom: 0px;
    overflow: scroll;
    border: solid 1px black
}